AutoCodes – Ford – P1633 1997 Ford F150

P1633 1997 Ford F150 Code - Keep Alive Power Voltage Too Low

Quick Answer

The Keep Alive Power (KAPWR) provides a constant voltage input independent of the ignition switch state to the Powertrain Control Module (PCM). Common causes include Open Keep Alive Power (KAPWR) circuit, Faulty Powertrain Control Module (PCM). Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1633 1997 Ford F150 indicates Keep Alive Power Voltage Too Low .
Common causes: Common causes include Open Keep Alive Power (KAPWR) circuit, Faulty Powertrain Control Module (PCM).
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 3,723

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jul 13, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1633 1997 Ford F150 Description

The Keep Alive Power (KAPWR) provides a constant voltage input independent of the ignition switch state to the Powertrain Control Module (PCM). This voltage is used by the PCM to maintain the Keep Alive Memory (KAM). The Diagnostic Trouble Code (DTC) indicates that the Keep Alive Power circuit has experienced a power interrupt. Loss of Keep Alive Power to the Powertrain Control Module results in immediate Malfunction Indicator Lamp (MIL) illumination and sets DTC P1633.

OBDII Code P1633 1997 Ford F150 - Keep Alive Power Voltage Too Low - AutoCodes.com — P1633 1997 Ford F150 Code - Keep Alive Power Voltage Too Low

What does this mean?

What are the Possible Causes of the DTC P1633 1997 Ford F150?

Open Keep Alive Power (KAPWR) circuit
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P1633 1997 Ford F150?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1633 1997 Ford F150 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1633 1997 Ford F150 code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1633 1997 Ford F150 Code

1. What does the OBDII code P1633 mean on a 1997 Ford F150?

- Code P1633 indicates that the Keep Alive Power (KAPWR) voltage to the Powertrain Control Module (PCM) is too low, which can affect the memory and settings of the PCM.

2. What are common symptoms of code P1633 in a 1997 Ford F150?

- Symptoms include engine stalling or hard starts, poor engine performance, and the Check Engine Light being illuminated.

3. What causes the P1633 code to appear on a 1997 Ford F150?

- Typical causes include a weak or dead battery, poor battery connections, a faulty PCM, or issues with the wiring or fuses related to the PCM power supply.

4. How can I fix the OBDII code P1633 on my 1997 Ford F150?

- To fix P1633, start by checking the battery voltage and health, inspecting and cleaning all battery and ground connections, checking the wiring and fuses related to the PCM, and if necessary, replacing the PCM.

5. Is it safe to drive my 1997 Ford F150 with the P1633 code?

- While it may be possible to drive, it's not recommended as the issue can lead to engine stalling, which might put you in unsafe driving situations. It's best to address the problem as soon as possible.

6. What tools are needed to diagnose the P1633 code on a 1997 Ford F150?

- Diagnosing this code typically requires a digital multimeter to check voltages and resistances, a scan tool to read and clear codes, and possibly an oscilloscope to check signal patterns if the problem is complex.

7. Could a bad alternator cause the P1633 code in a 1997 Ford F150?

- Yes, a failing alternator can lead to low voltage problems, which might trigger the P1633 code if the PCM is not receiving sufficient voltage to maintain its keep alive memory.

8. How do I check the PCM connections for issues that might cause the P1633 code?

- Inspect the PCM connectors for signs of corrosion, damage, or loose connections. Ensure that all pins are clean and securely connected, and check the harness for any signs of wear or damage.

9. What is the role of the Keep Alive Memory in a 1997 Ford F150, and why is it important?

- The Keep Alive Memory (KAM) in the PCM stores vital data such as fault history, fuel trim, and other operational data. If the KAM voltage is too low, it can result in loss of this data, leading to engine performance issues.

10. Can a blown fuse cause the P1633 code on a 1997 Ford F150?

- Yes, a blown fuse linked to the PCM or its power circuits can result in the P1633 code. Always check the fuses associated with the PCM during your diagnosis.